High-precision laser spectroscopy of the CO A{sup 1}Π - X{sup 1}Σ{sup +} (2,0), (3,0), and (4,0) bands
- Department of Physics and Astronomy, and LaserLaB, VU University, De Boelelaan 1081, 1081 HV Amsterdam (Netherlands)
High-precision two-photon Doppler-free frequency measurements have been performed on the CO A{sup 1}Π - X{sup 1}Σ{sup +} fourth-positive system (2,0), (3,0), and (4,0) bands. Absolute frequencies of forty-three transitions, for rotational quantum numbers up to J = 5, have been determined at an accuracy of 1.6 × 10{sup −3} cm{sup −1}, using advanced techniques of two-color 2 + 1’ resonance-enhanced multi-photon ionization, Sagnac interferometry, frequency-chirp analysis on the laser pulses, and correction for AC-Stark shifts. The accurate transition frequencies of the CO A{sup 1}Π - X{sup 1}Σ{sup +} system are of relevance for comparison with astronomical data in the search for possible drifts of fundamental constants in the early universe. The present accuracies in laboratory wavelengths of Δλ/λ = 2 × 10{sup −8} may be considered exact for the purpose of such comparisons.
- OSTI ID:
- 22416046
- Journal Information:
- Journal of Chemical Physics, Vol. 142, Issue 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON MONOXIDE
COLOR
COMPARATIVE EVALUATIONS
CORRECTIONS
FREQUENCY MEASUREMENT
FUNDAMENTAL CONSTANTS
INTERFEROMETRY
IONIZATION
LASER SPECTROSCOPY
MULTI-PHOTON PROCESSES
PHOTONS
QUANTUM NUMBERS
RESONANCE
WAVELENGTHS